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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a1b7328643d4eea858dc64b44f8ed93d9b1e809596f4bcfa93fc64f31c61d0' 
  AND token = 'PKbbqOktQuWQsMqvocXkfXUMg1RVh2Aqca6rOBNF/XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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