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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f7e40f8524c1b9a7734b20c30c7179ff0afe76c870816365aa86f7735e5e36' 
  AND token = 'FTfm4RAyXnwtNfbp3ewTNazW7dEeo+Y5Z14uffN4g60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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