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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae7f088923fe1484a79fce4a09479f5a9fb96c48ba5eed567517f9e8bb4ce1c' 
  AND token = 'u9oHZDelLKA0VMGYzLzmpIyuXqu1aidZh0gAu2Vv41w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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