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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa43883dd52f36514381a371835efd6b3a4c8ff448918fada043f0156f35206' 
  AND token = 'yjf4Pjx1Rsqf3ZlouVIqcSj3feOavzO71puUl9E6NXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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