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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fba48aa7a69e7bc7e25b41fa314ea0601d860715fe5a592bdaceff893a552f2' 
  AND token = 'WKucvFgffnbpO4ouP1i724/m2pchbX+US/jAUDXQJSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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