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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad4197d6488857840d73f522e018cb14ca7c63b6820d5ec1506eb6758318678' 
  AND token = 'TvcY5ku2M9zhhu9HI0/CILLiKJ0oOSh8YcBoKdSUkko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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