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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '425df09aebf78be9d2d366fa10b0e244e4e2b517339315725112e48e5566c695' 
  AND token = 'I3oz+uMwqqprC1k4bv6j7zmToLOKltjN6UgMKTP9gpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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