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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa59c4cbd752f72712d736c9a61d7bf4fbca49051cb0a10fe4635f2c0a6224bf' 
  AND token = 'htw+D79A0xnMDwFXFRVXqRL95WmxYYZqTaTiAwzqPvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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