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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baeaf8c369f55e15625c0f5e1ecb04ff6f5a925ba008f74eb460377e27b7b3bf' 
  AND token = 'zCCF841nK5iruKCCRKleqq+XX8XGOvuIknehm9fVliI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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