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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0993941bd3b15a5af6d34c59c5d4306a52c47fed5a1b0aa0dcbccb6f0541264' 
  AND token = '5il6eSf5toB+ZXYvVfI7ChKKmiMaBlU1ypRfQ09O1kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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