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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92fe38ca34e4dbaf0c2948165d322a42a5050a3fe7d9187c0e27efd93bd7c3ec' 
  AND token = 'r48nU7t6aRWaVCQTaEurcBUyr45SFpi9JQjz4rnT5X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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