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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cf7cbdee37586fdc43697eff466f831a768b4b5e6af32e0ae65542097911f0' 
  AND token = 'K/V1Tyy5e4ySrc9Ngdp01KlG2q521Pkm7Mf12dgynGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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