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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c04fe0b097818f1c73dd8071f170c1d4782de23777411a0a79a3675b377630' 
  AND token = 'n/1fh5plcxmbKM0/lfUSxCzBSr97bLGWjcGXeyVVEaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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