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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8424a02684ade4c8243e931979a7cf33794ce9c9a4752117cc2ae8d08f35f58' 
  AND token = '46xvVYnaG77Xk4IoYk2HbYDQrjMP5kKsKyQOS+1lHsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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