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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c772f2065a85c8351fad5b1674d3ec2a29c881055364920a938cfeb51c77de69' 
  AND token = 'TjZffdPRyX4dQg60l2Osn2dLbbnfRURsIcjOGDNQDpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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