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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83fce48fa1ea17420eb0e1f72313ec509ca3b923e2ae70769499cc6921abd8eb' 
  AND token = 'zrueSBedwg3qK46S75QXkkyHnpJa9OUl0IBvoKG8SKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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