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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7ba3cda03615c02001d5edea3e10b064605fb9b25e2e3f49218cfc50d263c9' 
  AND token = 'hGEHFqOgBdH7OI4kpmoQjXTpkNCAqM+BIl/ruajW8jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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