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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fdc19ecbce34279887a15aeb2185e1ece9da1c40a3eeeca6c8dffbff60264a7' 
  AND token = '3cqNu6zGsTh4GMjX2yrm5sLPprjl6vGqpKlTRGSamIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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