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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '006651e284d92ee185e94a27efcd651cf41dfe577d5406a9d4f940dc0a6e7355' 
  AND token = 'taZ88l8RgGIE9bDKg1HpK8Z4cqA89WOntSvq5JwAFfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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