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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03bebb14ef99f705f3dc80969027f903f2b4971a7f30c715c0ec53de827fc829' 
  AND token = 'IKFH8+S1tUml/VQMQfDpwJvsfhDl9dpkaPvU7h2IKao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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