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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775d98e852a34540f61990cc113129bbc8763bdeace49a5472c24d67fd4243e7' 
  AND token = 'w9dVwNePec4cyxHg0zyOi4vzic26F5e6Ckd1/uB7sjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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