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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b471292c3fda0e7a8875ce3e0199803eb4eea4a66eee46f7344d2db7c32354f' 
  AND token = '908YMxsYk/noG+DuNHS0iE9GT47Z3xzMxIiM/3Qu8NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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