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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b746e2ec59ae0bccabbb645f393039e6212bdc0d5b058ec83e0081f2c91fd09' 
  AND token = 'YKxA5RvKO9ISjEaHbnM1Os62rMjes4kUMfbSHEcN7Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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