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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e61c5cd3cb98ab173df124ffca0a5e7bd2b8c3ad4ce27de17c2b9745451fea6' 
  AND token = 'pXx5FApH9BILr8agHKk1KLdPgj6W1PwktMB2y+iPwZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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