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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e092e6f09171553c683b2d5756e0342e697486fff990ee092c5c09a9ca67140' 
  AND token = 'At8p/KVTNTsqjoyUemuIF8kHEUsgfanFnAqGBdIp3yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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