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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50c9bb98a4993bd9f360deeec1be4bd614edbb7654edb8db606e1bb0c2c8845' 
  AND token = 'zxgGusO5nABEmZ8NnI739e78J2w2yRdJrzdpU7D9poU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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