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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af02b4e1ae3450e454e91ee7ec9fd2304ee1625d6342ec2fe78df682b61f3fcb' 
  AND token = 'cs+KY/U6vCW2RqFVN2CqCjdJ7BiuYPdoBWbXXoDoxYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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