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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ad866b361a281fe68f720445328bfa68e4d4051c9e9a1e63a8c26127556dc1' 
  AND token = '/t6bzN4qkQed4ZK1m8HAygIjQ/3AaQ5DgCpvLEPK43g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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