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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ab933f1e5804cd86ef7a5e30c3afbeed7396fab1339c9b70b085dc9aa09ee1' 
  AND token = 'JiVINtd6UgxfRYKIfZMml6RRxyXMWqvRJST06oTIfG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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