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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472e2fafa770edbf76955c0cba34fce45f6d64136fa8519a8f4d9544e0c48adf' 
  AND token = '9BWQBFHlVBMsKB4AimI0m/ylSWmowmAjWvBuaG8vC6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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