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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79829f53fea954a3694dd54af65cb28e7271805e87746b6dbac099002fa233e' 
  AND token = 'asU1Th+AdOz1GZeju4yKiSgUjQam8P9xIEMckUWUq2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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