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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b71c20ce1d83b7461363e2ee9a14ad3bb50133d5626236d2a5ce43df17f155a' 
  AND token = 'zFv46IQyBmrMLcY1tWL2AKiVqyT5uIhXDmBMDP7cGXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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