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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827f83e7882b847d1a025ee6bb0317cbcc55c8962a7b4564f19bfefbf0c5e9fa' 
  AND token = 'CPp5vpMgKvzVOqbDKTA/pD+rxo75p4oN9+00V15jiDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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