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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8cac422fd6b1654cdac86e0000556e85ff18129d21687e3f83ff0a49d8c17ad' 
  AND token = 'x3H7uMecE4c50i3rwviaIQlWu3ZeJEtkZPgxUAEs8X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}