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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd30316fe964c302d0b7e25b3340af68c948c5203bf74e641e5a7ae181185f89' 
  AND token = 'x+EmWkgxY/6i0V77y5KlBaGAbn2pS8jnuhbODRnbUTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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