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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01975f37ec97a312b1840d749fb192c9f43f174546b948f3a9a9276380f36a4' 
  AND token = 'yeY7mi6vDU6RQtMgwUOTcKZC8mNJml7UalrjW+7EgLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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