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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3907eb55cfe734cdfa44ee832cce3cd1ca1f958f497f8048664f7c811a360013' 
  AND token = 'kETV7Aukx8iVMgtB5cpRxLrjJ5upnTykIgvZFizVY24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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