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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c694252f663a2994dbc605bc8dd8979f602ce5b213e5f7f24b8d83eb9f453411' 
  AND token = 'xbyn51ZGcLAavNmLejKme+ruU9c3H0XjawIqrdYmHrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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