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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ed94c27776b8397949efd4d63987b35adc7b35b21830fef30f5e1397645f4b' 
  AND token = 'dnmZ5ASObIzZ22keppadT7E4GQ5YrCc5bMihmNfCtdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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