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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36264ebaf15545aa9d0821bcc9abfaa55d0b48a8dfef4fdbe3bd5b02ba26abf' 
  AND token = 'C+CvqOqQQ3I/JYx4lQkNm8aKjS8Yrp8VTaOpSFYD67A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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