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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69b7e6fd45e1e70d92e826fe26ab80a9283fd8200628030e2ae8a8267238a14' 
  AND token = '5z8YqKyrp7vAzyEDHJXFYHJnVBKeFsMse0g71tJru9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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