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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017d901da69d507fc8f5d55c89d4de544bc0e30306e74b01075c3045d928edd4' 
  AND token = 'OFFSdXxaQ830kGh/1mZ5xhqjOG9sN5+3thDw7YrEhNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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