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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4925d6c0e81d7cdf22383dc90f7c447ff9c78170ad60786a5e9ca5f2291b1540' 
  AND token = 'eRoComGV+qiCtrbC/HITc0jQWU91HKSUC1mNKYO8im0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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