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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87ac4f17107e28aaf009ea977678df3248e6eaa2035d3f84daff501e1b019a6' 
  AND token = 'ng6lPe/zJ8rtJz9dS3r3a5W/Fr1eJ1l94HszmBj4wjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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