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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf52b0f320bfcb90e47d97cf25bc3a869f4dca9cfe0e8460303c66412b1a4bf' 
  AND token = 'Kh8VsmabYCye0OEky43dUqaoMchLRCCqy0PQRymuVbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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