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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d205ab16e9dd92ac68361f5d803f0912fa5d760543acaf7a44fc7e2f8a940a' 
  AND token = '0c7r4Yj1EpbBc3y08lVOobHlR3982LgFNKNjnr0X7jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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