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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1fc10b767646fc1c62525d0bd1664eb74329b4f7ee634c2863fc966af7be92' 
  AND token = 'KiPwpfO5xsOMuPzdo+ZOILMBMwcYqe80xpNYGYIV8o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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