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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa2aa501601cecc6aa505b9d6161504850192937fc9b02884a46e80765142d9' 
  AND token = 'QHmDKS4K19gQzCGDI496cyQtWKb8DnYIvcyxqOlx+Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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