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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f203a3ed181374e624be6e242439c892d9fd16098464ef18804da38939a181d' 
  AND token = 'xoJkB4a/zG8xDi/Oy//cFhiGfG13uNOFpSMO6mvpFII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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