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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc74d5fc8e0c51150ec9f57821192af8dc0ea91b3bf6457557ae119c78a46d44' 
  AND token = 'fcO434cJm8vrottv10bUZlgQhaqw9kygBJiSbCFlvSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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