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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe6a7e2dc10c727a89740679adcee8e4b6662b840f163b64ca6717c74cce49d' 
  AND token = 'ZPbDDW2bs7vXLeopfsWWkdUr5wwhBnUMGNGh3I3TR9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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