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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271bc6797cc2d450260fb722b09db9ac399fd6a7464b2519d24cc1769e09a1d7' 
  AND token = 'te15Q5mTcmAxNluG9vpV9TjlGstrlKSueNcQJ13Q8YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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