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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c209b3c8a8498313499ef9ac5f7204e03e8e2bdade849bac6c7b31ef453d6b' 
  AND token = 'HMg0GtWP3NI+vHW2aD0F+n19sr6/59WkNkLu+v4FhvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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