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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155b5fcc8c8e3f96ca92c90b5a77423772bc5e951ff107befa2f60224ea7d58c' 
  AND token = 'GbLKW0HiqZS5uInsHHD1Svf1RAyEn2Ga5jjsyB72bak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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