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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30af69a43a0901c1108329ba69a12b6551decaf15f827c08d8d8e3956c0ba0cd' 
  AND token = 'aEE35mqpjsBClC7gEmIP4eY5nrTR9UuDMvaMcsN/oXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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