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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60263936940cc43608355aee0e58789fb40c7a8c936e8d3217c5ee4c475293d5' 
  AND token = 'XyiSkkCmOloOKEAI7Zu3eHyXNYwfIrwcTdEGqcnUtcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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