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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaec77bf7bfc495a4fe3cc0aef0c793cdb25169e9236ad58a0b1691eb48275b5' 
  AND token = 'BEI2OHHJ5D40OtOOI5KR9ta4Y1jUAZjHZhUIZjsp51A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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