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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a654a79a18125d20bf8a2ec72d0045c9c8f80045c5333acbeeaad3f82ea972' 
  AND token = 'bhLuggbQa7yUZQ2W9VeAvdZMiChh6tcJZIhYjLHwvG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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