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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3fc4a118b7bf8751dc249a7dcb603dded7b67abe6209f745bb210d26ad37fd' 
  AND token = 'r9tUpqC4cRzzcn9lZF/d9z8ffP9/0Y3Te2kfSRgQmRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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